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TRANSISTOR OUTPUT CIRCUIT, SEMICONDUCTOR DEVICE INCLUDING TRANSISTOR OUTPUT CIRCUIT, AND SWITCHING POWER SUPPLY PROVIDED THE TRANSISTOR OUTPUT CIRCUIT
TRANSISTOR OUTPUT CIRCUIT, SEMICONDUCTOR DEVICE INCLUDING TRANSISTOR OUTPUT CIRCUIT, AND SWITCHING POWER SUPPLY PROVIDED THE TRANSISTOR OUTPUT CIRCUIT
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机译:晶体管输出电路,包括晶体管输出电路和开关电源的半导体器件,提供晶体管输出电路
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摘要
PROBLEM TO BE SOLVED: To reduce through current of the transistor output circuit remarkably, to raise/lower an output signal up (down) to power source potential (upper limit value) and ground potential (lower limit value), and to smoothly change the output signal at a part in the vicinity of the power source potential and the ground potential.;SOLUTION: A main driver obtained by connecting an NPN and a PNP in series is driven by the output of a predriver having a first CMOS circuit driven by an input signal. In addition, an assist circuit having a second CMOS circuit driven by the input signal and a current restriction resistor is provided, and the output of the main driver is assisted by the output of the assist circuit. Thus, electromagnetic noise (EMI) is made small and a switching output with sufficient amplitude is supplied.;COPYRIGHT: (C)2004,JPO
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